CORROSION OF MATERIALS IN SURFACE SEA WATER AFTER 6 MONTHS OF EXPOSURE,
 Technical Note N-1023, Naval Civil Engineering Laboratory, Port Hueneme, CA by Fred M. Reinhard, March 1969, 76 pages.

A total of 880 specimens of 215 different alloys were completely immersed in surface sea water for six months to obtain data for comparison with deep ocean corrosion data.

Corrosion rates, types of corrosion, pit depths, and changes in mechanical properties were determined.

The highly alloyed nickel alloys, titanium alloys, silicon cast irons, specialty stainless steels, columbium, tantalum and tantalum-tungsten alloy were uncorroded both at the surface and at depth.

The corrosion rates of the copper base alloys, nickel base alloys, steels, and cast irons decreased as the concentration of oxygen in sea water decreased.

The copper base alloys, steels, cast irons, molybdenum, tungsten, leads and lead-tin solder corroded uniformly.

All the aluminum alloys were attacked by pitting and crevice corrosion and sea water was more aggressive at depth than at the surface. The effect of the oxygen concentration of sea water on the corrosion of aluminum alloys was inconsistent.

The stainless steels were attacked by crevice, pitting, edge and tunnel corrosion except types 310, 317 and 329, 2OCb, 2OCb-3 and AM350 on which there was only incipient crevice corrosion. Crevice corrosion was more severe in surface waters than at depth.

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